OMG!!!! this is AMAZING .... PURE GENIUS!!!!! A trick for hanging photo collections: Lay out your arrangement. Flip frames over. Lay waxed paper on top of frames. Mark hanger/nail spot on waxed paper. Flip waxed paper over and tape to wall, nail into wall where indicated. Tear down waxed paper. Hang photos.-- Found this ONE day after I spent HOURS hanging a "gallery wall" - Click image to find more DIY & Crafts Pinterest pins
78 Layouts for Hanging Photographs and Artworks on Empty Walls Like a Pro
When making a collage going up a staircase keep in mind to mimic the staircase lines in your collage. Also make sure to measure on every second or third step the distance from the collage to the stair to make sure it has the same distance consistently.